<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="" />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px':'200px' ">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区 -->
        <el-menu background-color="#262b34" text-color="#fff" active-text-color="#4897E2" unique-opened
        :collapse="isCollapse"
        :collapse-transition="false"
        :router="true"
        :default-active="activePath"
        >
        <!-- 为了保证是bool值 必须动态数据绑定 -->
          <!-- 一级菜单 -->
          <!-- :index="item.id +''" 绑定属性同时数字转为字符串 -->
          <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
            <!-- 一级菜单模板区 -->
            <template slot="title">
              <!-- 图标 动态绑定图标-->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{ item.authName }}</span>
            </template>
            <!-- 二级别菜单 -->
            <!-- <el-menu-item :index="itemChildren.id + ''" v-for="itemChildren in item.children" :key="itemChildren.id"> -->
            <el-menu-item :index="'/'+itemChildren.path + ''" v-for="itemChildren in item.children"
            :key="itemChildren.id"
            @click="saveNavState('/'+itemChildren.path)">
              <!-- 二级别菜单模板区 -->
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{ itemChildren.authName }}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容 -->
      <el-main>
        <!-- 放一个路由站位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data () {
    // 左侧菜单数据
    return {
      menulist: [],
      // 解决图标问题
      iconsObj: {
        125: 'iconfont icon-users',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      // 是否折叠
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  created () {
    this.getMenuList()
    // 生命周期创建时加载
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout () {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取所有菜单
    async getMenuList () {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menulist = res.data
    },
    // 点击按钮 切换
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    },
    // 保存连接激活状态
    saveNavState (activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}
// 注意组件名称就是class名称
.el-header {
  background-color: #363d40;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  span {
    margin-left: 15px;
  }
}
.el-aside {
  background-color: #262b34;
  .el-menu{
    border-right: none;
  }
}
.el-main {
  background-color: #e9edf1;
}
.iconfont {
  margin-right: 10px;
}
.toggle-button{
  background-color: #313743;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>
